As of November 2024, OpenTofu serves as an open-source alternative to Terraform, offering varying degrees of compatibility depending on the Terraform version in use.
Compatibility Overview:
Terraform 1.5.x and 1.6.x: OpenTofu is designed to be a drop-in replacement for these versions, ensuring full compatibility. Users can migrate without altering their existing configurations.
OPEN TOFU
Terraform 1.7.x and 1.8.x: While OpenTofu maintains compatibility with these versions, some minor adjustments may be necessary during migration. Detailed migration guides are available to assist users in this process.
OPEN TOFU
Terraform 1.9.x and Later: Migrating from these versions to OpenTofu may require more significant effort. Users should consult the latest migration documentation to understand the specific steps involved.
Recommendation:
For users on Terraform 1.5.x or 1.6.x, transitioning to OpenTofu is straightforward and requires minimal changes. Those using versions 1.7.x or 1.8.x should refer to the provided migration guides to ensure a smooth transition. Users on versions 1.9.x and beyond should prepare for a more involved migration process and stay updated with the latest OpenTofu documentation.
For comprehensive migration instructions, please visit OpenTofu's official documentation.